Ensure the stack is properly aligned in the SIPI handler. This
avoids an exception when an aligned instruction is performed on
stack data.
BUG=b:66003093
TEST=boot kahlee built with gcc 6.3
Change-Id: Ibdd8242494c6a2bc0c6ead7ac98be55149219d7c
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/21768
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>